/** * Fetch OmbHulpvorm which references this OmbHulp. Will return null in case reference is invalid. * `omb_hulp`.`genre` -> `omb_hulpvorm`.`id` * * @param PDO $db a PDO Database instance * @param array $sort array of DSC instances * @return OmbHulpvorm */ public function fetchOmbHulpvorm(PDO $db, $sort = null) { $filter = array(OmbHulpvorm::FIELD_ID => $this->getGenre()); $result = OmbHulpvorm::findByFilter($db, $filter, true, $sort); return empty($result) ? null : $result[0]; }